crash investigators headed to mexico to help determine cause of plane crash that killed singer jenni rivera. we are learning more about the jet and people at the controls. katie marzullo is in the newsroom with the new details. >> reporter: mexican officials are hoping to find the black box which will tell them if the jet had a mechanical problem or voice er so they can hear what the pilots were saying -- in their last moments. u.s. is sending a team from nhtsa to help with the search and the investigation. small twin engine was 43-years-old and had been in an did in way to it ran off the runway in texas. nhtsa blamed pilot error. the pilots logged 19 hours on their shift, one was 78-years-old many an investigators says that may not matter. >> there is no age limit for pilots as long as you can pass a medical. >> reporter: it will take up to 10 days for initial results of the investigation. right now no apparent cause of the crash, which has left fans on both sides of the border in deep mourning. other high profile crashes involving learjets golfer stewart and few others were killed